Mason Tvert is director of communications at the Marijuana Policy Project (MPP). He co-directed the campaign in support of Amendment 64, the successful 2012 statewide ballot initiative to regulate marijuana like alcohol in Colorado.

Previously, he directed the campaigns in support of the successful Denver ballot initiatives to remove all penalties for marijuana possession (2005) and designate it the city’s lowest law enforcement priority (2007). In 2007, he was appointed by then-Mayor John Hickenlooper to the Denver Marijuana Policy Review Panel. Mason is a cofounder, board member, and former executive director of Safer Alternative For Enjoyable Recreation (SAFER), a Colorado-based non-profit organization dedicated to educating the public about the relative harms of marijuana and alcohol, and he is a coauthor of Marijuana Is Safer: So why are we driving people to drink?

He has been featured or quoted in articles published by the Associated Press, Reuters, USA Today, the New York Times, the Washington Post, the Los Angeles Times, the Denver Post, Time magazine, Rolling Stone, and the Chronicle of Higher Education, among other publications throughout Colorado and nationwide. He has also been a guest on CNN, MSNBC, FOX News Channel, NPR, the BBC, and HBO's Real Time with Bill Maher.